Vol. 3 No. 1
Efficacy of some herbicides for ecosafety and economic weed management in transplanted Kharif Rice.
Author(s): D. PAL, M. PRAMANICK, D. MANDAL, B. C. PATRA AND M. SARDAR
Abstract: Field experiment was conducted in a randomized block design with three replications at Instructional Farm of New Alluvial Zone, BCKV at Jaguli, Nadia, West Bengal during kharif seasons of 2003 – 2004 on sandy clay loam soil having pH 7.01 with the objectives to study the efficacy of some herbicides in transplanted kharif rice vis-à-vis to develop a safe farmer’s acceptable economic method of chemical weed control. The experimental results revealed that among the ten treatments, Hand weeding twice at 25 and 45 DAT (Days after transplanting) gave the highest grain yield (4.50 t ha-1), which, however did not differ significantly with the treatment Fentrazamide 50 WP @ 150 g.a.i. ha-1 applied as pre-emergence at 7 DAT. This herbicide @ 150 g.a.i. ha-1 offered promising control of all categories of dominant weeds and finally gave second highest grain yield (4.39 tha-1), exhibiting no phytotoxicity symptom to the crop plant. Regarding benefit : cost ratio, highest value (1.03) was obtained with the use of Fentrazamide 50WP @ 150 g.a.i. ha-1 which was closely followed by Fentrazamide 50 WP @ 120 g.a.i. ha-1 (0.94). So tedious, time consuming and costly hand weeding method can profitably be replaced by the application of Fentrazamide 50 WP @ 150 g.a.i. ha-1 as pre-emergence at 4-7 DAT, which has been found to be the most cost saving and also a safe weed control treatment.
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